Manager Ron Roenicke expects right-hander Marco Estrada to fill a spot. If Chris Narveson is recovered from shoulder surgery that limited him to just two starts a year ago, he'll be back in the rotation.

Gallardo made 33 starts in 2012, posting a 16-9 record and 3.66 ERA while striking out 204.

Prospects will compete for the final rotation spots.

Mike Fiers has the most big league experience of the group, starting 22 games last season while posting a 9-10 record and a 3.74 ERA.

Former No. 1 draft pick Mark Rogers, who has had injury issues, was 6-6 with a 4.72 ERA in 18 starts with Triple-A Nashville and 3-1 with a 3.92 ERA in seven starts with the Brewers before he was shut down for the season.

After a slow start with Nashville, Wily Peralta made five starts late in the season with the Brewers and went 2-1 with a 2.48 ERA.

"Peralta has a huge upside," Roenicke said. "If he pitches like he did a few of those games last year, he's got a huge upside."

Milwaukee will also have depth in the minor leagues with Tyler Thornurg and Hiram Burgos.

Thornburg was Milwaukee's third-round draft choice in 2010 and has moved quickly through the system. He went 10-4 last year between Double-A Huntsville and Nashville and made a few appearances with Milwaukee during the season.

Burgos was the organization's minor league pitcher of the year last season, going 10-4 with a 1.95 ERA in 28 games with Nashville, Huntsville and Class A Brevard County, striking out 153 batters and walking just 49.

"The nice thing is we don't have just three guys for those three spots," Roenicke said. "We've got two or three other guys we feel comfortable can do it. Going into it knowing that it's not just these three guys and you have to do it all year, we don't have to do that. We've got four guys we know can pitch in the big leagues for three spots."

"I'm not saying it's a gamble," general manager Doug Melvin said. "When I wake up every morning, it's a gamble. But we felt this was the time and opportunity to give them the ball. They all pitched very well. We like the ballclub. There were a lot of positives that took place in August and September of last season."

Milwaukee looked for pitching help during free agency, showing interest in right-hander Ryan Dempster but the Brewers weren't willing to commit to a three-year contract and Dempster signed with Boston. Other candidates came with prices deemed a little too high, leading the Brewers to stick with what they have.

The Brewers' payroll was $101 million at the start of 2012 but the team decided to cut costs this year, leaving some wiggle room to add players as the season goes on.

"We saw last year with our ability to get back into the playoff race with two (wild cards), you can be seven or 10 games out at midseason and still have a shot," Brewers owner Mark Attanasio said.

"Now we are in position this year, even if we are back seven, eight, nine or 10 games, to add at midseason given where we have our payroll if we have the right kind of player come up depending how we see the division playing out at that time."

The influx of young talent played a big part as the Brewers surged back into contention in 2012, finishing the season with a 27-13 record and going from 12 games under .500 to wild-card contention in the season's final weeks.

"We were encouraged by their performance last August and September," Melvin said. "They performed well enough to give us confidence. The challenge is doing it over the course of the marathon season."

Melvin and the Brewers also had to rework the bullpen over the winter.

The bullpen was a big factor in the Brewers missing the playoffs as they led the majors with 29 blown saves. To shore up the bullpen, Melvin signed left-handers Tom Gorzelanny and Mike Gonzalez from Washington and traded for Tampa Bay's Burke Badenhop.